[cphubbell@aol.com]

There are a lot of moving parts to this. You don’t say how old the grandchildren are or if you will accompany them which can change prices and the need to be there Christmas week. Redweek.com will show you all timeshare rentals in the area so it’s a great reference.
You should also look at mousesavers.com and undercovertourist.com. Talking with a Disney reservation person would also be a good idea as they can lead you to various discounts. There are Disney affiliated hotels near Disney Springs and the new Drury would be one to check. Call now, it’s not too early.
Looking at the Disney website itself for restaurants and menus will give you pricing to be able to plan as those costs can sneak up on you.
Good luck!